Macro bitcoin_internals::const_tools::copy_byte_array_from_slice

macro_rules! copy_byte_array_from_slice {
    ($slice:expr, $len:expr) => { ... };
}

Copies first $len bytes from $slice and returns them as an array.

Returns None if $len > $slice.len(). $len must be (obviously) statically known. Calling from non-const context doesn’t affect performance.